Fusible type hold open arm



June 30, 1931.

D. R'. LASIER FUSIBLE TYPE HOLD-OPEN ARM Filed March 5. 1929 2Sheets-Sheet 1 June 30, 1931. p, LAslER 1,812,408

FUSIBLE TYPE HOLD-OPEN ARM Filed March 5, 1329 2 Sheets-Sheet 2 PatentedJune 30, 1931 DAVID R. LASIER,

PATENT OFFICE OF CHICAGO,'ILLINOIS, ASSIGNOR TO NORTON-LASIER COMPANY,OF

CHICAGO, ILLINOIS,.A CORPORATION OF ILLINOIS FUSIBLE PE HOLD O ABM DApplication filed March 5, 1929. Serial No. 344,213.

" This invention relates to holding devices of the type usually appliedto doors, windows and similar closure means, for holding the door,window or similar means in a predetermined open position, and to holdingdevices which are effected under conditions of term perature above, by apredetermined amount, the highestatmospheric temperature to whichthedevice will be exposed, to render the holding means ineffectivewhereby the closure means held open by the device will'be free to swingor move to its closedposition, in

the event of accidental occurrence. of fire.

An object of this invention is to provide a novel: deviceadaptedto beoperatively con- 'nectedbetween a stationary part and the closure;means, such as between the door sill. and

. door, for'instanceand operative to hold the closure meansin anydesired" predetermined open position and effective automatically whenthe closure means is moved and urged into said predeterminedopen-position, andto release the closure means when the device isexposed to a predetermined temperature;

Another object of this invention is to provide a novel form of holdingmeans, which is simple in operation and construction and highlyefficient in operation and one in which the release-is accomplishedwithout disturbing the holding parts.

Another object is to provide a novel holdingdevice equipped withtemperature responsive means, such as a fusible link for controlling thereleasing mechanism, Whereby exposure to a predetermined temperaturewill cause the, release, and consequent closing'of the closure means. l

In the illustrated form of this invention,

the holding device isdisclosed as a p'airof pivoted links or arms,having holding friction faces of substantially the construction shown inapplicants co-pending application,

"Serial No. 190,427, filed May 11th, 1927, for

improvementsin door holding arms but it is to be understood that theholding mechanism maybe located at any one of the pivots, that is tosay, either at the pivot between the links asshown at the pivot betweenone of the links and the door sill or at the pivot betweenthe other linkand the door.

Itv is obvious that the holding device requires merely for itssuccessful operation, a relative movement between parts, the relat1vemovement between which is caused by the opening and closing movement ofthe door, and therefore, as this condition exists at any one of thepivots, any one of these locations will serve. In fact, certain of theselocations have advantages over certain of the other locations, underparticular circumstances, such as the number of degrees of swing of thedoor, location at which holding is desired and the use or non use ofdoor closmg and checking devices with the holding device, etc., andaccordingly the invention is not to be-limited by the disclosure in thisparticular, as all of the various locations are contemplated for theholding mechanism.

Also the particular type of holding mechanism may vary within limits asthis invention relates to the combination of suitable holding mechanismand releasing mechanismfor rendering the holding mechanism inoperative,and consequently any suitable holding mechanism may be employed.

It is to be further understoodv that the releasing mechanism is tobelocated in close proximity to the pivot at which the holding means islocated so as to serve as a. substitute pivot therefor in the event thereleasing mechanism is brought into operation. Furthermore, it is to beunderstood that the device contemplated in this invention may be usedeither with or without door closing and checking devices.

Various objects not specifically enumerated and. in addition to. thoseabove mentioned, will readily appear to anyone skilled in the art towhich this invention pertains, as the following description proceeds.

The disclosure is to be considered merely as one embodiment of thisinvention which is given merely by way of example and the scope of theinvention is to be determined from a complete understanding of thisdisclosure, and an appreciation of the advantages which the invent-ionproduces in this illustrative form. The invention will be more readilyunderstood by referring to the accompanying drawings in which Figure 1is a perspective view of a holding device constructed in accordance withthis invention,

Figure 2 is a plan view of'the construction shown in Figural, with theparts thereof in displaced positions to better show their constructionand operation. Y

Figures 3, 4 and 5 are enlarged perspective views-of parts of the deviceshown in Figure; 1, disclosing the construction and arrange;

ment, and g I Figure 6 is a-nwenlarged View of the fusible link employedin Figure 1. I

By referring to the drawings,it will-be noted that my invention isillustrated as applied toa door holding device comprising a pairof'linlrs 10 and 11 which with the'exception of the improvementscontemplated in this invention, are similar in construction to theholding device disclosed in the, applicants co-pending application abovereferred to and which are adapted to be mounted in the manner disclosedin said application. I

The parts which are not essential to a complete understanding 'of thisinvention have been omitted from the drawings and description as theyare disclosed as constructed and mountedln the manner shown 1n theco-pending application where the construction and mounting arecompletely shown in detail.

Accordingly, the link 10 is provided with- 'a head 12 having an opening13-fadapted to be mounted to adoor check. 7 The 111 514 is provided forconnecting the arm with the .doo r check in the usual manner. At theopposite-endof the arm 10, a head 15 is pro vided, better shown Figure4, having the center pivot opening 16 and the spiral friction face 17.Pivotedito, and cooperating with; the end of the arm 10, is theelement-18,

yshownin Figures 3 and 4 having the threaded opening 19 and spiral face20. The friction face 20 is'adapt'ed to cooperate with the friction face17 whereby uponrelativeoscillation of these two. parts the outersurfaces of the head 15 and the element 18 will separate and approacheach other. p

Positioned through; the'pivot opening 16 is thebolt 21 provided with thethread end 22 adapted for thread engagement withzthe position so as toreceive thejlock nut ifand the outside faceof the head15, is the:washer25. It will be appreciated that wh'en the boltis positionedthrough the head 15 and the element 18 so as to form a'pivot bearing 7therefor, that angular movement of, the element 18 relative to the head15, in one direction, will cause a binding of the parts due "to the factthat, according-to the particular l adjustment of the bolt 'only alimited clear the face 32 onthe lug 28.

when the parts are-in assembled position as ance is provided for theexpansion movement. In this manner by properly adjusting the bolt, soasto provide a predetermined clearance, the element 18 and head 15 canbe brought into a binding engagement at any predetermined angularposition. I

The particular adjustment'of the bolt, is maintained at all times by thelocking effect of the nut 23. When the device is installed,

7 the "element-18is' connected by mechanism hereinafter described toeither. the I door or door sill and the head 15 carried on the arm 10 ispivotally connected to the other of said parts and the bolt is adjustedto produce the binding of the friction facesin that position of the head15 and element 18 at which it is desired to hold the door.

Except insofar as the element 18 being an independent part pivotallyconnected to the arm 11, instead of beingrigid therewith, the operationand construction of the device above given is substantially like that ofthe co-pending application above referred to.

The element 18 is provided with a pivot lug 26, having the pivot opening27 and in addition, a locking lug 28. Pivotally connected'by means of apin 29, to the pivot lug 26, is the element 30. This element is providedwith a straight faced portion 31,

adapted to abut the surface 32of the locking lug '28 on the firstelement so as to prevent I pivotal movement between these parts in onedirection. [The element cooperatesgwith the pivot pin 29 by means of thepivotopening 33; 'The element 30- is provided on one side, with thepivot lug 34having the pivotal iopening 35'for' pivotally receiving thelock- 'ing' dog 36, secured thereto by means of the pivotbearings 37 andpivot pin 38.

The locking dog is provided. witha shoul der 39 and an extended nose 40.Secured to'the element 18 by means of the screw 41 and bushing 42 is afusible link 43 having the opening 44 at one end through which the screwextends and the opening 45 at its other end adaptedto fit over andengage the nose 40 of 'thelocking dog 36. The length of the fusible linkissuch that the link holds the locking dog in intimate engagement withthe locking lug 28 in the manner shown in Figure 1. The

various parts are so constructed that when the locking dog is inengagement with the lug 28 as shown in Figure 1, the flat face'portion31 of the element 30 isinclose contact with shown in Figure 1, theelement 18 is held rigidly relative to the element 30 whereby in effectthese parts are a single rigid mem- 47 adapted to receive by means ofthe pivot pin 48, the portion 49 of the linkll. Portion 49 isprovided-with an opening 50 and Consequently locking screw 51 adapted toadjustably receive a rod constructed at its opposite end for abutment toeither the door or the door sill as the case may be. This part is notshown as it is of the same construction as that shown in the applicantsco-pending application.

In operation, the holding device is mounted in the customary manner withthe parts arranged as shown in Figure 1 whereby the elements 18 and 30will be rigidly held together in a manner to cause these parts tofunction as a unitary arm or link. In this event, the holding devicecomprising the cooperating friction faces functions in the manner of thedevice in the co-pending application, acting to hold the door in anypredetermined open position according to the particular adjustment ofthe pivot bolt 21.

In the event of fire, such that the fusible link 48 will be fused, theportions of the link will become separated leaving the locking dog 39free to disengage the lug 28. Under such circumstances, even though thefriction faces are firmly bound, in a manner to hold the door, theindependent pivot provided on the pin 29 acts as a substitute pivot andpermits the arms to be pivoted relative to elach other whereby the dooris free to swing s ut.

If the device is used in. combination with a door closing mechanism,whether of the checking type or any other type, this mechanism will urgethe door shut in the desired manner. It is of course understood thatdevices of this kind are employed, because in the event of fire, .it isdesirable to shut off from other portions of the building, that portionwhich is efiected by the fire.

The fusible link 43 is not described in detail because no claim is madeto the link per se except as a part of the combination herein defined,and the fusible link construction here disclosed is old and well known.

It, is obvious that the invention has application on all sorts ofclosures such as doors, windows, and the like and that the device wheninstalled, is connected to the closure such as a door at one end and toa stationary part, such as the sill at its other end and accordingly,the invention is to be construed broadly and as covering all suchinstallations. However, for the purpose of clarity, the applicant hasdefined his device as connected between a door and door sill but theseterms are to be considered as coverelement having a cooperating frictionface pivotally connected to the end of said link, a second elementpivoted to said first element, on an axis parallel with the pivotal axisbetween said link and first element, a lug on said first element, a dogpivoted to said second element, adapted for locking en gagement withsaid lug, and a fusible link for holding said dog in engagement withsaid lug.

2. A holding device adapted to be pivotally connected between a door anddoor sill respectively, comprising in combination, a link having afriction face at one end, an element having a cooperating friction facepivotally connected to the end of said link, a second element pivoted tosaid first element, on an axis parallel with the pivotal axis betweensaid link and first element, a lug on said first element, a dog pivotedto said second element, adapted for locking engagement with said lug,and a fusible link secured to said first element and engaging the end ofsaid dog.

Signed at Chicago, Illinois, this 1st day of March, 1929.

DAVID R. LASIER.

